combine data inital implementation

[KyleQianliMa]

Short description of the changes:

Long description of the changes:

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

[codecov-commenter]

Codecov Report

❌ Patch coverage is 24.44444% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.05%. Comparing base (c08dc34) to head (0240b3a).
⚠️ Report is 2 commits behind head on next.

Files with missing lines	Patch %	Lines
src/tavi/tavi_model/combine_data.py	33.33%	18 Missing ⚠️
src/tavi/tavi_model/tavi_project.py	13.33%	13 Missing ⚠️
src/tavi/tavi_model/filter.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next      #40      +/-   ##
==========================================
- Coverage   77.51%   77.05%   -0.46%     
==========================================
  Files          38       39       +1     
  Lines        3754     3788      +34     
==========================================
+ Hits         2910     2919       +9     
- Misses        844      869      +25     

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